The WILLIAMSAV powerful WIR TX9 DC emitter produces a wide-angle infrared signal that concentrates IR energy efficiently in the listening area. Operating on the 2.3-3.8 MHz bandwidth, the WIR TX9 DC is less susceptible to radio and lighting interference. Each WIR TX9 DC emitter can cover up to 30,000 sq. feet (2,787 sq. meters) in single-channel operation. The coverage area can be easily increased by daisy-chaining additional WIR TX9 DC emitters. A wall/ceiling omnidirectional mount is included, and stand kits are available for portable operation.